Plant Soil Environ., 2003, 49(7):321-326 | DOI: 10.17221/4131-PSE

Effects of heavy metal concentrations on biological activity of soil micro-organisms

M. ©mejkalová, O. Mikanová, L. Borůvka
1 Faculty of Biological Sciences, University of South Bohemia in České Budějovice, Czech Republic
2 Research Institute of Crop Production, Prague, Czech Republic
3 Czech University of Agriculture in Prague, Czech Republic

The distribution of cadmium, lead and zinc in exchangeable, organic, and 2M HNO3-extractable fractions as well as the effect of heavy metal concentrations on soil microflora was investigated. Six sampling transects were chosen in theLitavkaRiveralluvium in 1999-2001. Concentrations of all metals increased with decreasing distance from the source of contamination. The concentrations of Cd and Zn in exchangeable fraction were higher than in organically bound fraction, a reverse trend was found in Pb speciation. All measured parameters of soil microbial activity were affected by heavy metal concentrations. The decrease in CFU was most significant in the case of oligotrophic bacteria and spore-forming bacteria. Significant inhibition of C-biomass occurred in soils highly contaminated by heavy metals. The Cbiomass:Cox ratio decreased with increasing soil pollution. Generally, the values of enzymatic activities were highest in the soil above the source of contamination and they were decreased as approaching the source of contamination. Our results demonstrate that several parameters of microbial activity could be used as good indicators of increasing concentrations of Cd, Pb, and Zn in soil.

Keywords: heavy metals; soil microflora; microbial and enzymatic activities; CFU

Published: July 31, 2003  Show citation

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©mejkalová M, Mikanová O, Borůvka L. Effects of heavy metal concentrations on biological activity of soil micro-organisms. Plant Soil Environ.. 2003;49(7):321-326. doi: 10.17221/4131-PSE.
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